Failure phenomenon of powder metallurgy oil bearing
The oil-impregnated bearing is made of metal powder and other anti-friction materials, which are pressed, sintered, shaped and oil-impregnated. It has a porous structure. After being infiltrated in hot oil, the pores are filled with lubricating oil, and the working is due to the rotation of the journal. The action and friction heat cause the metal and oil to expand by heat, and the oil is squeezed out of the pores, and the friction surface acts as a lubrication. After the bearing is cooled, the oil is sucked back into the pores.
When the product is put into use for a while, there will be some problems with the failure. In fact, this has an inseparable relationship with the quality of the product, but it may not always be caused by quality problems, or it may be caused by improper operation or different operating methods. We summarize some of the problems that arise when using powder metallurgy oil-impregnated bearings.
The most common problem in powder metallurgy oil-bearing bearings is the problem of tile surface corrosion. It can be found by spectral analysis that the concentration of non-ferrous metal elements is high, and there is more non-ferrous metal cost in the element spectrum, or water or acid in lubricating oil. Excessive values can cause this corrosion problem.
There is also a certain degree of pull-up and corrosion on the shaft diameter surface of the powder metallurgy oil-impregnated bearing, which is also due to the presence of all the cutting abrasive grains in the interior. The composition of the abrasive grains is mainly non-ferrous metals. If a certain amount of fretting wear is found on the back of the tile, it may be that the iron concentration is abnormal, and there are more sub-micron wear particles of iron composition.
Through analysis and summary, we can obtain the cause of the fault according to the problem of powder metallurgy oil bearing bearing problems, and develop effective and effective correction scheme to ensure the effective service life of the product.
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